windows 10 shutting down when windows window shows

I have two asus m4a78lt m le pc , after installing windows 10 they both will shut down just when the windows 10 window shows, If i press the restart power button again straight away they will start as normal, I have changed cmos batteries and changed a few settings in bios, seems windows ten is setting the system up for a restart every time, any ideas ?
I have another asus pc with a different mobo it has not got this problem.
Phill

noticed other windows 10 problems at startup rebooting loop which they had to turn off the fast boot option, worked for for my shut down at start up as well